%%%----------------------------------------------------------------------------
%%% Simple calculator in concurrent programming with error handling.
%%% Copyright (c) 2011, Nycholas de Oliveira e Oliveira <nycholas@gmail.com>
%%% All rights reserved.
%%%
%%% Redistribution and use in source and binary forms, with or without
%%% modification, are permitted provided that the following conditions are met:
%%%
%%% % Redistributions of source code must retain the above copyright notice,
%%%    this list of conditions and the following disclaimer.
%%% % Redistributions in binary form must reproduce the above copyright notice,
%%%    this list of conditions and the following disclaimer in the documentation
%%%    and/or other materials provided with the distribution.
%%% % Neither the name of the Nycholas de Oliveira e Oliveira nor the names of
%%%    its contributors may be used to endorse or promote products derived from
%%%    this software without specific prior written permission.
%%%
%%% THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
%%% AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
%%% IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
%%% ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
%%% LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
%%% CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
%%% SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
%%% INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
%%% CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
%%% ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
%%% POSSIBILITY OF SUCH DAMAGE.
%%%----------------------------------------------------------------------------
-module(server).

-revision('Revision: 0.1 ').
-created('Date: 2011/11/13 11:04:00 ').
-created_by('nycholas@gmail.com').
-modified('Date: 2011/11/13 11:04:00 ').
-modified_by('nycholas@gmail.com').

-export([loop/0, on_exit/2]).
    
loop() ->
    receive
        {sum, A, B} ->
            N = A + B,
            io:format("  -> ~p + ~p = ~p~n", [A, B, N]),
            loop();
        {subtract, A, B} ->
            N = A - B,
            io:format("  -> ~p - ~p = ~p~n", [A, B, N]),
            loop();
        {multiplies, A, B} ->
            N = A * B,
            io:format("  -> ~p * ~p = ~p~n", [A, B, N]),
            loop();
        {divides, A, B} ->
            N = A / B,
            io:format("  -> ~p / ~p = ~p~n", [A, B, N]),
            loop();
        Other ->
            io:format("  -> Not found operation: ~p~n", [Other]),
            loop()
    end.

on_exit(Pid, Fun) ->
    spawn(fun() ->
        process_flag(trap_exit, true),
        link(Pid),
        receive
            {'EXIT', Pid, Why} ->
                Fun(Why)
        end 
    end).
